Answer: Are you talking about the speed with which the seed germinates? Though your generalization may be reasonable, I wouldn't be surprised if there are some common "weedy" perennials whose seeds germinate faster than some annuals.
In general, though, everything about an annual happens at a faster rate. Keep in mind that an annual only lives one season, so they really have to keep things moving at a quick clip to germinate, grow, flower, and produce seed all in a few short months. Perennials, on the other hand, often spend a lot of their energy during the first growing season developing an extensive root system that will store enough food to allow the plants survive the winter and regrow the next season.
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